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I would go a tad higher (£230-£250) and go for an R290X.
Got a suitable PSU and case for a good GFX card?
Bgrade - https://www.overclockers.co.uk/showproduct.php?prodid=BG-392-GI&groupid=595&catid=683 - says the ETA is today.
90 day warranty? I'd just wait to see if they drop in price.